The supermassive black hole (SMBH) at our galaxy’s core, Sagittarius A*, is modest in size with only 4.15 million solar-masses. The Event Horizon Telescope (EHT) recently released a dramatic submillimeter image of it as seen illuminated by its glowing environment. Many galaxies have nuclear SMBHs that are a thousand times bigger, for example the nucleus of M87, whose image was taken by the EHT in 2020. But SagA* is relatively close to us, only about twenty-five thousand light-years, and its proximity offers astronomers a unique opportunity to probe the properties of SMBHs.
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Source: Phys.org